Add an underlay for javascript, and add ikiwiki.js containing some utility code.

* Add an underlay for javascript, and add ikiwiki.js containing some utility
  code.
* toggle: Stop embedding the full toggle code on each page using it, and
  move it to toggle.js in the javascript underlay.

2 files changed, 66 insertions, 0 deletions

diff --git a/underlays/javascript/ikiwiki.js b/underlays/javascript/ikiwiki.js
new file mode 100644
index 000000000..29de7ec6f
--- /dev/null
+++ b/underlays/javascript/ikiwiki.js
@@ -0,0 +1,37 @@
+// ikiwiki's javascript utility function library
+
+var hooks = new Array;
+window.onload = run_hooks_onload;
+
+function run_hooks_onload() {
+	run_hooks("onload");
+}
+
+function run_hooks(name) {
+	for (var i = 0; i < hooks.length; i++) {
+		if (hooks[i].name == name) {
+			hooks[i].call();
+		}
+	}
+}
+
+function hook(name, call) {
+	var h={name: name, call: call};
+	hooks.push(h);
+}
+
+function getElementsByClass(cls, node, tag) {
+        if (document.getElementsByClass)
+                return document.getElementsByClass(cls, node, tag);
+        if (! node) node = document;
+        if (! tag) tag = '*';
+        var ret = new Array();
+        var pattern = new RegExp("(^|\\s)"+cls+"(\\s|$)");
+        var els = node.getElementsByTagName(tag);
+        for (i = 0; i < els.length; i++) {
+                if ( pattern.test(els[i].className) ) {
+                        ret.push(els[i]);
+                }
+        }
+        return ret;
+}
diff --git a/underlays/javascript/toggle.js b/underlays/javascript/toggle.js
new file mode 100644
index 000000000..d190b737a
--- /dev/null
+++ b/underlays/javascript/toggle.js
@@ -0,0 +1,29 @@
+// Uses CSS to hide toggleables, to avoid any flashing on page load. The
+// CSS is only emitted after it tests that it's going to be able
+// to show the toggleables.
+if (document.getElementById && document.getElementsByTagName && document.createTextNode) {
+	document.write('<style type="text/css">div.toggleable { display: none; }</style>');
+	hook("onload", inittoggle);
+}
+
+function inittoggle() {
+	var as = getElementsByClass('toggle');
+	for (var i = 0; i < as.length; i++) {
+		var id = as[i].href.match(/#(\w.+)/)[1];
+		if (document.getElementById(id).className == "toggleable")
+			document.getElementById(id).style.display="none";
+		as[i].onclick = function() {
+			toggle(this);
+			return false;
+		}
+	}
+}
+
+function toggle(s) {
+	var id = s.href.match(/#(\w.+)/)[1];
+	style = document.getElementById(id).style;
+	if (style.display == "none")
+		style.display = "block";
+	else
+		style.display = "none";
+}